“Home doesn’t change anything related to your privacy settings on Facebook, and your privacy controls work the same with Home as they do everywhere else on Facebook,” the company wrote in the blog post.

But Om questioned on Thursday whether that’s really the case, since the HTC First phone with Facebook Home deeply integrated will have far more capabilities than a simple Android app, with the accelerometer in the phone having the ability to track how fast you’re moving, or the phone’s sensors detecting the location of your home based on the times of day you’re not checking in:

“The new Home app/UX/quasi-OS is deeply integrated into the Android environment. It takes an effort to shut it down, because Home’s whole premise is to be always on and be the dashboard to your social world. It wants to be the start button for apps that are on your Android device, which in turn will give Facebook a deep insight on what is popular. And of course, it can build an app that mimics the functionality of that popular, fast-growing mobile app. I have seen it done before, both on other platforms and on Facebook.

But there is a bigger worry. The phone’s GPS can send constant information back to the Facebook servers, telling it your whereabouts at any time.”